sys/net/rtsock.c

   1 /*-
   2  * Copyright (c) 1988, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)rtsock.c    8.7 (Berkeley) 10/12/95
  30  * $FreeBSD$
  31  */
  32 #include "opt_compat.h"
  33 #include "opt_mpath.h"
  34 #include "opt_inet.h"
  35 #include "opt_inet6.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/jail.h>
  39 #include <sys/kernel.h>
  40 #include <sys/domain.h>
  41 #include <sys/lock.h>
  42 #include <sys/malloc.h>
  43 #include <sys/mbuf.h>
  44 #include <sys/priv.h>
  45 #include <sys/proc.h>
  46 #include <sys/protosw.h>
  47 #include <sys/rwlock.h>
  48 #include <sys/signalvar.h>
  49 #include <sys/socket.h>
  50 #include <sys/socketvar.h>
  51 #include <sys/sysctl.h>
  52 #include <sys/systm.h>
  53
  54 #include <net/if.h>
  55 #include <net/if_var.h>
  56 #include <net/if_dl.h>
  57 #include <net/if_llatbl.h>
  58 #include <net/if_types.h>
  59 #include <net/netisr.h>
  60 #include <net/raw_cb.h>
  61 #include <net/route.h>
  62 #include <net/vnet.h>
  63
  64 #include <netinet/in.h>
  65 #include <netinet/if_ether.h>
  66 #include <netinet/ip_carp.h>
  67 #ifdef INET6
  68 #include <netinet6/ip6_var.h>
  69 #include <netinet6/scope6_var.h>
  70 #endif
  71
  72 #ifdef COMPAT_FREEBSD32
  73 #include <sys/mount.h>
  74 #include <compat/freebsd32/freebsd32.h>
  75
  76 struct if_msghdr32 {
  77         uint16_t ifm_msglen;
  78         uint8_t ifm_version;
  79         uint8_t ifm_type;
  80         int32_t ifm_addrs;
  81         int32_t ifm_flags;
  82         uint16_t ifm_index;
  83         struct  if_data ifm_data;
  84 };
  85
  86 struct if_msghdrl32 {
  87         uint16_t ifm_msglen;
  88         uint8_t ifm_version;
  89         uint8_t ifm_type;
  90         int32_t ifm_addrs;
  91         int32_t ifm_flags;
  92         uint16_t ifm_index;
  93         uint16_t _ifm_spare1;
  94         uint16_t ifm_len;
  95         uint16_t ifm_data_off;
  96         struct  if_data ifm_data;
  97 };
  98
  99 struct ifa_msghdrl32 {
 100         uint16_t ifam_msglen;
 101         uint8_t ifam_version;
 102         uint8_t ifam_type;
 103         int32_t ifam_addrs;
 104         int32_t ifam_flags;
 105         uint16_t ifam_index;
 106         uint16_t _ifam_spare1;
 107         uint16_t ifam_len;
 108         uint16_t ifam_data_off;
 109         int32_t ifam_metric;
 110         struct  if_data ifam_data;
 111 };
 112 #endif /* COMPAT_FREEBSD32 */
 113
 114 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
 115
 116 /* NB: these are not modified */
 117 static struct   sockaddr route_src = { 2, PF_ROUTE, };
 118 static struct   sockaddr sa_zero   = { sizeof(sa_zero), AF_INET, };
 119
 120 /* These are external hooks for CARP. */
 121 int     (*carp_get_vhid_p)(struct ifaddr *);
 122
 123 /*
 124  * Used by rtsock/raw_input callback code to decide whether to filter the update
 125  * notification to a socket bound to a particular FIB.
 126  */
 127 #define RTS_FILTER_FIB  M_PROTO8
 128
 129 typedef struct {
 130         int     ip_count;       /* attached w/ AF_INET */
 131         int     ip6_count;      /* attached w/ AF_INET6 */
 132         int     any_count;      /* total attached */
 133 } route_cb_t;
 134 static VNET_DEFINE(route_cb_t, route_cb);
 135 #define V_route_cb VNET(route_cb)
 136
 137 struct mtx rtsock_mtx;
 138 MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF);
 139
 140 #define RTSOCK_LOCK()   mtx_lock(&rtsock_mtx)
 141 #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx)
 142 #define RTSOCK_LOCK_ASSERT()    mtx_assert(&rtsock_mtx, MA_OWNED)
 143
 144 static SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD, 0, "");
 145
 146 struct walkarg {
 147         int     w_tmemsize;
 148         int     w_op, w_arg;
 149         caddr_t w_tmem;
 150         struct sysctl_req *w_req;
 151 };
 152
 153 static void     rts_input(struct mbuf *m);
 154 static struct mbuf *rtsock_msg_mbuf(int type, struct rt_addrinfo *rtinfo);
 155 static int      rtsock_msg_buffer(int type, struct rt_addrinfo *rtinfo,
 156                         struct walkarg *w, int *plen);
 157 static int      rt_xaddrs(caddr_t cp, caddr_t cplim,
 158                         struct rt_addrinfo *rtinfo);
 159 static int      sysctl_dumpentry(struct radix_node *rn, void *vw);
 160 static int      sysctl_iflist(int af, struct walkarg *w);
 161 static int      sysctl_ifmalist(int af, struct walkarg *w);
 162 static int      route_output(struct mbuf *m, struct socket *so, ...);
 163 static void     rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out);
 164 static void     rt_dispatch(struct mbuf *, sa_family_t);
 165 static struct sockaddr  *rtsock_fix_netmask(struct sockaddr *dst,
 166                         struct sockaddr *smask, struct sockaddr_storage *dmask);
 167
 168 static struct netisr_handler rtsock_nh = {
 169         .nh_name = "rtsock",
 170         .nh_handler = rts_input,
 171         .nh_proto = NETISR_ROUTE,
 172         .nh_policy = NETISR_POLICY_SOURCE,
 173 };
 174
 175 static int
 176 sysctl_route_netisr_maxqlen(SYSCTL_HANDLER_ARGS)
 177 {
 178         int error, qlimit;
 179
 180         netisr_getqlimit(&rtsock_nh, &qlimit);
 181         error = sysctl_handle_int(oidp, &qlimit, 0, req);
 182         if (error || !req->newptr)
 183                 return (error);
 184         if (qlimit < 1)
 185                 return (EINVAL);
 186         return (netisr_setqlimit(&rtsock_nh, qlimit));
 187 }
 188 SYSCTL_PROC(_net_route, OID_AUTO, netisr_maxqlen, CTLTYPE_INT|CTLFLAG_RW,
 189     0, 0, sysctl_route_netisr_maxqlen, "I",
 190     "maximum routing socket dispatch queue length");
 191
 192 static void
 193 rts_init(void)
 194 {
 195         int tmp;
 196
 197         if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp))
 198                 rtsock_nh.nh_qlimit = tmp;
 199         netisr_register(&rtsock_nh);
 200 }
 201 SYSINIT(rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rts_init, 0);
 202
 203 static int
 204 raw_input_rts_cb(struct mbuf *m, struct sockproto *proto, struct sockaddr *src,
 205     struct rawcb *rp)
 206 {
 207         int fibnum;
 208
 209         KASSERT(m != NULL, ("%s: m is NULL", __func__));
 210         KASSERT(proto != NULL, ("%s: proto is NULL", __func__));
 211         KASSERT(rp != NULL, ("%s: rp is NULL", __func__));
 212
 213         /* No filtering requested. */
 214         if ((m->m_flags & RTS_FILTER_FIB) == 0)
 215                 return (0);
 216
 217         /* Check if it is a rts and the fib matches the one of the socket. */
 218         fibnum = M_GETFIB(m);
 219         if (proto->sp_family != PF_ROUTE ||
 220             rp->rcb_socket == NULL ||
 221             rp->rcb_socket->so_fibnum == fibnum)
 222                 return (0);
 223
 224         /* Filtering requested and no match, the socket shall be skipped. */
 225         return (1);
 226 }
 227
 228 static void
 229 rts_input(struct mbuf *m)
 230 {
 231         struct sockproto route_proto;
 232         unsigned short *family;
 233         struct m_tag *tag;
 234
 235         route_proto.sp_family = PF_ROUTE;
 236         tag = m_tag_find(m, PACKET_TAG_RTSOCKFAM, NULL);
 237         if (tag != NULL) {
 238                 family = (unsigned short *)(tag + 1);
 239                 route_proto.sp_protocol = *family;
 240                 m_tag_delete(m, tag);
 241         } else
 242                 route_proto.sp_protocol = 0;
 243
 244         raw_input_ext(m, &route_proto, &route_src, raw_input_rts_cb);
 245 }
 246
 247 /*
 248  * It really doesn't make any sense at all for this code to share much
 249  * with raw_usrreq.c, since its functionality is so restricted.  XXX
 250  */
 251 static void
 252 rts_abort(struct socket *so)
 253 {
 254
 255         raw_usrreqs.pru_abort(so);
 256 }
 257
 258 static void
 259 rts_close(struct socket *so)
 260 {
 261
 262         raw_usrreqs.pru_close(so);
 263 }
 264
 265 /* pru_accept is EOPNOTSUPP */
 266
 267 static int
 268 rts_attach(struct socket *so, int proto, struct thread *td)
 269 {
 270         struct rawcb *rp;
 271         int error;
 272
 273         KASSERT(so->so_pcb == NULL, ("rts_attach: so_pcb != NULL"));
 274
 275         /* XXX */
 276         rp = malloc(sizeof *rp, M_PCB, M_WAITOK | M_ZERO);
 277         if (rp == NULL)
 278                 return ENOBUFS;
 279
 280         so->so_pcb = (caddr_t)rp;
 281         so->so_fibnum = td->td_proc->p_fibnum;
 282         error = raw_attach(so, proto);
 283         rp = sotorawcb(so);
 284         if (error) {
 285                 so->so_pcb = NULL;
 286                 free(rp, M_PCB);
 287                 return error;
 288         }
 289         RTSOCK_LOCK();
 290         switch(rp->rcb_proto.sp_protocol) {
 291         case AF_INET:
 292                 V_route_cb.ip_count++;
 293                 break;
 294         case AF_INET6:
 295                 V_route_cb.ip6_count++;
 296                 break;
 297         }
 298         V_route_cb.any_count++;
 299         RTSOCK_UNLOCK();
 300         soisconnected(so);
 301         so->so_options |= SO_USELOOPBACK;
 302         return 0;
 303 }
 304
 305 static int
 306 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 307 {
 308
 309         return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */
 310 }
 311
 312 static int
 313 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 314 {
 315
 316         return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */
 317 }
 318
 319 /* pru_connect2 is EOPNOTSUPP */
 320 /* pru_control is EOPNOTSUPP */
 321
 322 static void
 323 rts_detach(struct socket *so)
 324 {
 325         struct rawcb *rp = sotorawcb(so);
 326
 327         KASSERT(rp != NULL, ("rts_detach: rp == NULL"));
 328
 329         RTSOCK_LOCK();
 330         switch(rp->rcb_proto.sp_protocol) {
 331         case AF_INET:
 332                 V_route_cb.ip_count--;
 333                 break;
 334         case AF_INET6:
 335                 V_route_cb.ip6_count--;
 336                 break;
 337         }
 338         V_route_cb.any_count--;
 339         RTSOCK_UNLOCK();
 340         raw_usrreqs.pru_detach(so);
 341 }
 342
 343 static int
 344 rts_disconnect(struct socket *so)
 345 {
 346
 347         return (raw_usrreqs.pru_disconnect(so));
 348 }
 349
 350 /* pru_listen is EOPNOTSUPP */
 351
 352 static int
 353 rts_peeraddr(struct socket *so, struct sockaddr **nam)
 354 {
 355
 356         return (raw_usrreqs.pru_peeraddr(so, nam));
 357 }
 358
 359 /* pru_rcvd is EOPNOTSUPP */
 360 /* pru_rcvoob is EOPNOTSUPP */
 361
 362 static int
 363 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 364          struct mbuf *control, struct thread *td)
 365 {
 366
 367         return (raw_usrreqs.pru_send(so, flags, m, nam, control, td));
 368 }
 369
 370 /* pru_sense is null */
 371
 372 static int
 373 rts_shutdown(struct socket *so)
 374 {
 375
 376         return (raw_usrreqs.pru_shutdown(so));
 377 }
 378
 379 static int
 380 rts_sockaddr(struct socket *so, struct sockaddr **nam)
 381 {
 382
 383         return (raw_usrreqs.pru_sockaddr(so, nam));
 384 }
 385
 386 static struct pr_usrreqs route_usrreqs = {
 387         .pru_abort =            rts_abort,
 388         .pru_attach =           rts_attach,
 389         .pru_bind =             rts_bind,
 390         .pru_connect =          rts_connect,
 391         .pru_detach =           rts_detach,
 392         .pru_disconnect =       rts_disconnect,
 393         .pru_peeraddr =         rts_peeraddr,
 394         .pru_send =             rts_send,
 395         .pru_shutdown =         rts_shutdown,
 396         .pru_sockaddr =         rts_sockaddr,
 397         .pru_close =            rts_close,
 398 };
 399
 400 #ifndef _SOCKADDR_UNION_DEFINED
 401 #define _SOCKADDR_UNION_DEFINED
 402 /*
 403  * The union of all possible address formats we handle.
 404  */
 405 union sockaddr_union {
 406         struct sockaddr         sa;
 407         struct sockaddr_in      sin;
 408         struct sockaddr_in6     sin6;
 409 };
 410 #endif /* _SOCKADDR_UNION_DEFINED */
 411
 412 static int
 413 rtm_get_jailed(struct rt_addrinfo *info, struct ifnet *ifp,
 414     struct rtentry *rt, union sockaddr_union *saun, struct ucred *cred)
 415 {
 416
 417         /* First, see if the returned address is part of the jail. */
 418         if (prison_if(cred, rt->rt_ifa->ifa_addr) == 0) {
 419                 info->rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
 420                 return (0);
 421         }
 422
 423         switch (info->rti_info[RTAX_DST]->sa_family) {
 424 #ifdef INET
 425         case AF_INET:
 426         {
 427                 struct in_addr ia;
 428                 struct ifaddr *ifa;
 429                 int found;
 430
 431                 found = 0;
 432                 /*
 433                  * Try to find an address on the given outgoing interface
 434                  * that belongs to the jail.
 435                  */
 436                 IF_ADDR_RLOCK(ifp);
 437                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 438                         struct sockaddr *sa;
 439                         sa = ifa->ifa_addr;
 440                         if (sa->sa_family != AF_INET)
 441                                 continue;
 442                         ia = ((struct sockaddr_in *)sa)->sin_addr;
 443                         if (prison_check_ip4(cred, &ia) == 0) {
 444                                 found = 1;
 445                                 break;
 446                         }
 447                 }
 448                 IF_ADDR_RUNLOCK(ifp);
 449                 if (!found) {
 450                         /*
 451                          * As a last resort return the 'default' jail address.
 452                          */
 453                         ia = ((struct sockaddr_in *)rt->rt_ifa->ifa_addr)->
 454                             sin_addr;
 455                         if (prison_get_ip4(cred, &ia) != 0)
 456                                 return (ESRCH);
 457                 }
 458                 bzero(&saun->sin, sizeof(struct sockaddr_in));
 459                 saun->sin.sin_len = sizeof(struct sockaddr_in);
 460                 saun->sin.sin_family = AF_INET;
 461                 saun->sin.sin_addr.s_addr = ia.s_addr;
 462                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin;
 463                 break;
 464         }
 465 #endif
 466 #ifdef INET6
 467         case AF_INET6:
 468         {
 469                 struct in6_addr ia6;
 470                 struct ifaddr *ifa;
 471                 int found;
 472
 473                 found = 0;
 474                 /*
 475                  * Try to find an address on the given outgoing interface
 476                  * that belongs to the jail.
 477                  */
 478                 IF_ADDR_RLOCK(ifp);
 479                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 480                         struct sockaddr *sa;
 481                         sa = ifa->ifa_addr;
 482                         if (sa->sa_family != AF_INET6)
 483                                 continue;
 484                         bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr,
 485                             &ia6, sizeof(struct in6_addr));
 486                         if (prison_check_ip6(cred, &ia6) == 0) {
 487                                 found = 1;
 488                                 break;
 489                         }
 490                 }
 491                 IF_ADDR_RUNLOCK(ifp);
 492                 if (!found) {
 493                         /*
 494                          * As a last resort return the 'default' jail address.
 495                          */
 496                         ia6 = ((struct sockaddr_in6 *)rt->rt_ifa->ifa_addr)->
 497                             sin6_addr;
 498                         if (prison_get_ip6(cred, &ia6) != 0)
 499                                 return (ESRCH);
 500                 }
 501                 bzero(&saun->sin6, sizeof(struct sockaddr_in6));
 502                 saun->sin6.sin6_len = sizeof(struct sockaddr_in6);
 503                 saun->sin6.sin6_family = AF_INET6;
 504                 bcopy(&ia6, &saun->sin6.sin6_addr, sizeof(struct in6_addr));
 505                 if (sa6_recoverscope(&saun->sin6) != 0)
 506                         return (ESRCH);
 507                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin6;
 508                 break;
 509         }
 510 #endif
 511         default:
 512                 return (ESRCH);
 513         }
 514         return (0);
 515 }
 516
 517 /*ARGSUSED*/
 518 static int
 519 route_output(struct mbuf *m, struct socket *so, ...)
 520 {
 521         struct rt_msghdr *rtm = NULL;
 522         struct rtentry *rt = NULL;
 523         struct radix_node_head *rnh;
 524         struct rt_addrinfo info;
 525         struct sockaddr_storage ss;
 526 #ifdef INET6
 527         struct sockaddr_in6 *sin6;
 528         int i, rti_need_deembed = 0;
 529 #endif
 530         int alloc_len = 0, len, error = 0, fibnum;
 531         struct ifnet *ifp = NULL;
 532         union sockaddr_union saun;
 533         sa_family_t saf = AF_UNSPEC;
 534         struct rawcb *rp = NULL;
 535         struct walkarg w;
 536
 537         fibnum = so->so_fibnum;
 538
 539 #define senderr(e) { error = e; goto flush;}
 540         if (m == NULL || ((m->m_len < sizeof(long)) &&
 541                        (m = m_pullup(m, sizeof(long))) == NULL))
 542                 return (ENOBUFS);
 543         if ((m->m_flags & M_PKTHDR) == 0)
 544                 panic("route_output");
 545         len = m->m_pkthdr.len;
 546         if (len < sizeof(*rtm) ||
 547             len != mtod(m, struct rt_msghdr *)->rtm_msglen)
 548                 senderr(EINVAL);
 549
 550         /*
 551          * Most of current messages are in range 200-240 bytes,
 552          * minimize possible re-allocation on reply using larger size
 553          * buffer aligned on 1k boundaty.
 554          */
 555         alloc_len = roundup2(len, 1024);
 556         if ((rtm = malloc(alloc_len, M_TEMP, M_NOWAIT)) == NULL)
 557                 senderr(ENOBUFS);
 558
 559         m_copydata(m, 0, len, (caddr_t)rtm);
 560         bzero(&info, sizeof(info));
 561         bzero(&w, sizeof(w));
 562
 563         if (rtm->rtm_version != RTM_VERSION) {
 564                 /* Do not touch message since format is unknown */
 565                 free(rtm, M_TEMP);
 566                 rtm = NULL;
 567                 senderr(EPROTONOSUPPORT);
 568         }
 569
 570         /*
 571          * Starting from here, it is possible
 572          * to alter original message and insert
 573          * caller PID and error value.
 574          */
 575
 576         rtm->rtm_pid = curproc->p_pid;
 577         info.rti_addrs = rtm->rtm_addrs;
 578
 579         info.rti_mflags = rtm->rtm_inits;
 580         info.rti_rmx = &rtm->rtm_rmx;
 581
 582         /*
 583          * rt_xaddrs() performs s6_addr[2] := sin6_scope_id for AF_INET6
 584          * link-local address because rtrequest requires addresses with
 585          * embedded scope id.
 586          */
 587         if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info))
 588                 senderr(EINVAL);
 589
 590         info.rti_flags = rtm->rtm_flags;
 591         if (info.rti_info[RTAX_DST] == NULL ||
 592             info.rti_info[RTAX_DST]->sa_family >= AF_MAX ||
 593             (info.rti_info[RTAX_GATEWAY] != NULL &&
 594              info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX))
 595                 senderr(EINVAL);
 596         saf = info.rti_info[RTAX_DST]->sa_family;
 597         /*
 598          * Verify that the caller has the appropriate privilege; RTM_GET
 599          * is the only operation the non-superuser is allowed.
 600          */
 601         if (rtm->rtm_type != RTM_GET) {
 602                 error = priv_check(curthread, PRIV_NET_ROUTE);
 603                 if (error)
 604                         senderr(error);
 605         }
 606
 607         /*
 608          * The given gateway address may be an interface address.
 609          * For example, issuing a "route change" command on a route
 610          * entry that was created from a tunnel, and the gateway
 611          * address given is the local end point. In this case the
 612          * RTF_GATEWAY flag must be cleared or the destination will
 613          * not be reachable even though there is no error message.
 614          */
 615         if (info.rti_info[RTAX_GATEWAY] != NULL &&
 616             info.rti_info[RTAX_GATEWAY]->sa_family != AF_LINK) {
 617                 struct rt_addrinfo ginfo;
 618                 struct sockaddr *gdst;
 619
 620                 bzero(&ginfo, sizeof(ginfo));
 621                 bzero(&ss, sizeof(ss));
 622                 ss.ss_len = sizeof(ss);
 623
 624                 ginfo.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&ss;
 625                 gdst = info.rti_info[RTAX_GATEWAY];
 626
 627                 /*
 628                  * A host route through the loopback interface is
 629                  * installed for each interface adddress. In pre 8.0
 630                  * releases the interface address of a PPP link type
 631                  * is not reachable locally. This behavior is fixed as
 632                  * part of the new L2/L3 redesign and rewrite work. The
 633                  * signature of this interface address route is the
 634                  * AF_LINK sa_family type of the rt_gateway, and the
 635                  * rt_ifp has the IFF_LOOPBACK flag set.
 636                  */
 637                 if (rib_lookup_info(fibnum, gdst, NHR_REF, 0, &ginfo) == 0) {
 638                         if (ss.ss_family == AF_LINK &&
 639                             ginfo.rti_ifp->if_flags & IFF_LOOPBACK) {
 640                                 info.rti_flags &= ~RTF_GATEWAY;
 641                                 info.rti_flags |= RTF_GWFLAG_COMPAT;
 642                         }
 643                         rib_free_info(&ginfo);
 644                 }
 645         }
 646
 647         switch (rtm->rtm_type) {
 648                 struct rtentry *saved_nrt;
 649
 650         case RTM_ADD:
 651         case RTM_CHANGE:
 652                 if (info.rti_info[RTAX_GATEWAY] == NULL)
 653                         senderr(EINVAL);
 654                 saved_nrt = NULL;
 655
 656                 /* support for new ARP code */
 657                 if (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK &&
 658                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
 659                         error = lla_rt_output(rtm, &info);
 660 #ifdef INET6
 661                         if (error == 0)
 662                                 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
 663 #endif
 664                         break;
 665                 }
 666                 error = rtrequest1_fib(rtm->rtm_type, &info, &saved_nrt,
 667                     fibnum);
 668                 if (error == 0 && saved_nrt != NULL) {
 669 #ifdef INET6
 670                         rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
 671 #endif
 672                         RT_LOCK(saved_nrt);
 673                         rtm->rtm_index = saved_nrt->rt_ifp->if_index;
 674                         RT_REMREF(saved_nrt);
 675                         RT_UNLOCK(saved_nrt);
 676                 }
 677                 break;
 678
 679         case RTM_DELETE:
 680                 saved_nrt = NULL;
 681                 /* support for new ARP code */
 682                 if (info.rti_info[RTAX_GATEWAY] &&
 683                     (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) &&
 684                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
 685                         error = lla_rt_output(rtm, &info);
 686 #ifdef INET6
 687                         if (error == 0)
 688                                 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
 689 #endif
 690                         break;
 691                 }
 692                 error = rtrequest1_fib(RTM_DELETE, &info, &saved_nrt, fibnum);
 693                 if (error == 0) {
 694                         RT_LOCK(saved_nrt);
 695                         rt = saved_nrt;
 696                         goto report;
 697                 }
 698 #ifdef INET6
 699                 /* rt_msg2() will not be used when RTM_DELETE fails. */
 700                 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
 701 #endif
 702                 break;
 703
 704         case RTM_GET:
 705                 rnh = rt_tables_get_rnh(fibnum, saf);
 706                 if (rnh == NULL)
 707                         senderr(EAFNOSUPPORT);
 708
 709                 RADIX_NODE_HEAD_RLOCK(rnh);
 710
 711                 if (info.rti_info[RTAX_NETMASK] == NULL &&
 712                     rtm->rtm_type == RTM_GET) {
 713                         /*
 714                          * Provide logest prefix match for
 715                          * address lookup (no mask).
 716                          * 'route -n get addr'
 717                          */
 718                         rt = (struct rtentry *) rnh->rnh_matchaddr(
 719                             info.rti_info[RTAX_DST], rnh);
 720                 } else
 721                         rt = (struct rtentry *) rnh->rnh_lookup(
 722                             info.rti_info[RTAX_DST],
 723                             info.rti_info[RTAX_NETMASK], rnh);
 724
 725                 if (rt == NULL) {
 726                         RADIX_NODE_HEAD_RUNLOCK(rnh);
 727                         senderr(ESRCH);
 728                 }
 729 #ifdef RADIX_MPATH
 730                 /*
 731                  * for RTM_CHANGE/LOCK, if we got multipath routes,
 732                  * we require users to specify a matching RTAX_GATEWAY.
 733                  *
 734                  * for RTM_GET, gate is optional even with multipath.
 735                  * if gate == NULL the first match is returned.
 736                  * (no need to call rt_mpath_matchgate if gate == NULL)
 737                  */
 738                 if (rn_mpath_capable(rnh) &&
 739                     (rtm->rtm_type != RTM_GET || info.rti_info[RTAX_GATEWAY])) {
 740                         rt = rt_mpath_matchgate(rt, info.rti_info[RTAX_GATEWAY]);
 741                         if (!rt) {
 742                                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 743                                 senderr(ESRCH);
 744                         }
 745                 }
 746 #endif
 747                 /*
 748                  * If performing proxied L2 entry insertion, and
 749                  * the actual PPP host entry is found, perform
 750                  * another search to retrieve the prefix route of
 751                  * the local end point of the PPP link.
 752                  */
 753                 if (rtm->rtm_flags & RTF_ANNOUNCE) {
 754                         struct sockaddr laddr;
 755
 756                         if (rt->rt_ifp != NULL &&
 757                             rt->rt_ifp->if_type == IFT_PROPVIRTUAL) {
 758                                 struct ifaddr *ifa;
 759
 760                                 ifa = ifa_ifwithnet(info.rti_info[RTAX_DST], 1,
 761                                                 RT_ALL_FIBS);
 762                                 if (ifa != NULL)
 763                                         rt_maskedcopy(ifa->ifa_addr,
 764                                                       &laddr,
 765                                                       ifa->ifa_netmask);
 766                         } else
 767                                 rt_maskedcopy(rt->rt_ifa->ifa_addr,
 768                                               &laddr,
 769                                               rt->rt_ifa->ifa_netmask);
 770                         /*
 771                          * refactor rt and no lock operation necessary
 772                          */
 773                         rt = (struct rtentry *)rnh->rnh_matchaddr(&laddr, rnh);
 774                         if (rt == NULL) {
 775                                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 776                                 senderr(ESRCH);
 777                         }
 778                 }
 779                 RT_LOCK(rt);
 780                 RT_ADDREF(rt);
 781                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 782
 783 report:
 784                 RT_LOCK_ASSERT(rt);
 785                 if ((rt->rt_flags & RTF_HOST) == 0
 786                     ? jailed_without_vnet(curthread->td_ucred)
 787                     : prison_if(curthread->td_ucred,
 788                     rt_key(rt)) != 0) {
 789                         RT_UNLOCK(rt);
 790                         senderr(ESRCH);
 791                 }
 792                 info.rti_info[RTAX_DST] = rt_key(rt);
 793                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 794                 info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt),
 795                     rt_mask(rt), &ss);
 796                 info.rti_info[RTAX_GENMASK] = 0;
 797                 if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
 798                         ifp = rt->rt_ifp;
 799                         if (ifp) {
 800                                 info.rti_info[RTAX_IFP] =
 801                                     ifp->if_addr->ifa_addr;
 802                                 error = rtm_get_jailed(&info, ifp, rt,
 803                                     &saun, curthread->td_ucred);
 804                                 if (error != 0) {
 805                                         RT_UNLOCK(rt);
 806                                         senderr(error);
 807                                 }
 808                                 if (ifp->if_flags & IFF_POINTOPOINT)
 809                                         info.rti_info[RTAX_BRD] =
 810                                             rt->rt_ifa->ifa_dstaddr;
 811                                 rtm->rtm_index = ifp->if_index;
 812                         } else {
 813                                 info.rti_info[RTAX_IFP] = NULL;
 814                                 info.rti_info[RTAX_IFA] = NULL;
 815                         }
 816                 } else if ((ifp = rt->rt_ifp) != NULL) {
 817                         rtm->rtm_index = ifp->if_index;
 818                 }
 819
 820                 /* Check if we need to realloc storage */
 821                 rtsock_msg_buffer(rtm->rtm_type, &info, NULL, &len);
 822                 if (len > alloc_len) {
 823                         struct rt_msghdr *new_rtm;
 824                         new_rtm = malloc(len, M_TEMP, M_NOWAIT);
 825                         if (new_rtm == NULL) {
 826                                 RT_UNLOCK(rt);
 827                                 senderr(ENOBUFS);
 828                         }
 829                         bcopy(rtm, new_rtm, rtm->rtm_msglen);
 830                         free(rtm, M_TEMP);
 831                         rtm = new_rtm;
 832                         alloc_len = len;
 833                 }
 834
 835                 w.w_tmem = (caddr_t)rtm;
 836                 w.w_tmemsize = alloc_len;
 837                 rtsock_msg_buffer(rtm->rtm_type, &info, &w, &len);
 838
 839                 if (rt->rt_flags & RTF_GWFLAG_COMPAT)
 840                         rtm->rtm_flags = RTF_GATEWAY |
 841                                 (rt->rt_flags & ~RTF_GWFLAG_COMPAT);
 842                 else
 843                         rtm->rtm_flags = rt->rt_flags;
 844                 rt_getmetrics(rt, &rtm->rtm_rmx);
 845                 rtm->rtm_addrs = info.rti_addrs;
 846
 847                 RT_UNLOCK(rt);
 848                 break;
 849
 850         default:
 851                 senderr(EOPNOTSUPP);
 852         }
 853
 854 flush:
 855         if (rt != NULL)
 856                 RTFREE(rt);
 857         /*
 858          * Check to see if we don't want our own messages.
 859          */
 860         if ((so->so_options & SO_USELOOPBACK) == 0) {
 861                 if (V_route_cb.any_count <= 1) {
 862                         if (rtm != NULL)
 863                                 free(rtm, M_TEMP);
 864                         m_freem(m);
 865                         return (error);
 866                 }
 867                 /* There is another listener, so construct message */
 868                 rp = sotorawcb(so);
 869         }
 870
 871         if (rtm != NULL) {
 872 #ifdef INET6
 873                 if (rti_need_deembed) {
 874                         /* sin6_scope_id is recovered before sending rtm. */
 875                         sin6 = (struct sockaddr_in6 *)&ss;
 876                         for (i = 0; i < RTAX_MAX; i++) {
 877                                 if (info.rti_info[i] == NULL)
 878                                         continue;
 879                                 if (info.rti_info[i]->sa_family != AF_INET6)
 880                                         continue;
 881                                 bcopy(info.rti_info[i], sin6, sizeof(*sin6));
 882                                 if (sa6_recoverscope(sin6) == 0)
 883                                         bcopy(sin6, info.rti_info[i],
 884                                                     sizeof(*sin6));
 885                         }
 886                 }
 887 #endif
 888                 if (error != 0)
 889                         rtm->rtm_errno = error;
 890                 else
 891                         rtm->rtm_flags |= RTF_DONE;
 892
 893                 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
 894                 if (m->m_pkthdr.len < rtm->rtm_msglen) {
 895                         m_freem(m);
 896                         m = NULL;
 897                 } else if (m->m_pkthdr.len > rtm->rtm_msglen)
 898                         m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
 899
 900                 free(rtm, M_TEMP);
 901         }
 902         if (m != NULL) {
 903                 M_SETFIB(m, fibnum);
 904                 m->m_flags |= RTS_FILTER_FIB;
 905                 if (rp) {
 906                         /*
 907                          * XXX insure we don't get a copy by
 908                          * invalidating our protocol
 909                          */
 910                         unsigned short family = rp->rcb_proto.sp_family;
 911                         rp->rcb_proto.sp_family = 0;
 912                         rt_dispatch(m, saf);
 913                         rp->rcb_proto.sp_family = family;
 914                 } else
 915                         rt_dispatch(m, saf);
 916         }
 917
 918         return (error);
 919 }
 920
 921 static void
 922 rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out)
 923 {
 924
 925         bzero(out, sizeof(*out));
 926         out->rmx_mtu = rt->rt_mtu;
 927         out->rmx_weight = rt->rt_weight;
 928         out->rmx_pksent = counter_u64_fetch(rt->rt_pksent);
 929         /* Kernel -> userland timebase conversion. */
 930         out->rmx_expire = rt->rt_expire ?
 931             rt->rt_expire - time_uptime + time_second : 0;
 932 }
 933
 934 /*
 935  * Extract the addresses of the passed sockaddrs.
 936  * Do a little sanity checking so as to avoid bad memory references.
 937  * This data is derived straight from userland.
 938  */
 939 static int
 940 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
 941 {
 942         struct sockaddr *sa;
 943         int i;
 944
 945         for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
 946                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
 947                         continue;
 948                 sa = (struct sockaddr *)cp;
 949                 /*
 950                  * It won't fit.
 951                  */
 952                 if (cp + sa->sa_len > cplim)
 953                         return (EINVAL);
 954                 /*
 955                  * there are no more.. quit now
 956                  * If there are more bits, they are in error.
 957                  * I've seen this. route(1) can evidently generate these.
 958                  * This causes kernel to core dump.
 959                  * for compatibility, If we see this, point to a safe address.
 960                  */
 961                 if (sa->sa_len == 0) {
 962                         rtinfo->rti_info[i] = &sa_zero;
 963                         return (0); /* should be EINVAL but for compat */
 964                 }
 965                 /* accept it */
 966 #ifdef INET6
 967                 if (sa->sa_family == AF_INET6)
 968                         sa6_embedscope((struct sockaddr_in6 *)sa,
 969                             V_ip6_use_defzone);
 970 #endif
 971                 rtinfo->rti_info[i] = sa;
 972                 cp += SA_SIZE(sa);
 973         }
 974         return (0);
 975 }
 976
 977 /*
 978  * Fill in @dmask with valid netmask leaving original @smask
 979  * intact. Mostly used with radix netmasks.
 980  */
 981 static struct sockaddr *
 982 rtsock_fix_netmask(struct sockaddr *dst, struct sockaddr *smask,
 983     struct sockaddr_storage *dmask)
 984 {
 985         if (dst == NULL || smask == NULL)
 986                 return (NULL);
 987
 988         memset(dmask, 0, dst->sa_len);
 989         memcpy(dmask, smask, smask->sa_len);
 990         dmask->ss_len = dst->sa_len;
 991         dmask->ss_family = dst->sa_family;
 992
 993         return ((struct sockaddr *)dmask);
 994 }
 995
 996 /*
 997  * Writes information related to @rtinfo object to newly-allocated mbuf.
 998  * Assumes MCLBYTES is enough to construct any message.
 999  * Used for OS notifications of vaious events (if/ifa announces,etc)
1000  *
1001  * Returns allocated mbuf or NULL on failure.
1002  */
1003 static struct mbuf *
1004 rtsock_msg_mbuf(int type, struct rt_addrinfo *rtinfo)
1005 {
1006         struct rt_msghdr *rtm;
1007         struct mbuf *m;
1008         int i;
1009         struct sockaddr *sa;
1010 #ifdef INET6
1011         struct sockaddr_storage ss;
1012         struct sockaddr_in6 *sin6;
1013 #endif
1014         int len, dlen;
1015
1016         switch (type) {
1017
1018         case RTM_DELADDR:
1019         case RTM_NEWADDR:
1020                 len = sizeof(struct ifa_msghdr);
1021                 break;
1022
1023         case RTM_DELMADDR:
1024         case RTM_NEWMADDR:
1025                 len = sizeof(struct ifma_msghdr);
1026                 break;
1027
1028         case RTM_IFINFO:
1029                 len = sizeof(struct if_msghdr);
1030                 break;
1031
1032         case RTM_IFANNOUNCE:
1033         case RTM_IEEE80211:
1034                 len = sizeof(struct if_announcemsghdr);
1035                 break;
1036
1037         default:
1038                 len = sizeof(struct rt_msghdr);
1039         }
1040
1041         /* XXXGL: can we use MJUMPAGESIZE cluster here? */
1042         KASSERT(len <= MCLBYTES, ("%s: message too big", __func__));
1043         if (len > MHLEN)
1044                 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
1045         else
1046                 m = m_gethdr(M_NOWAIT, MT_DATA);
1047         if (m == NULL)
1048                 return (m);
1049
1050         m->m_pkthdr.len = m->m_len = len;
1051         rtm = mtod(m, struct rt_msghdr *);
1052         bzero((caddr_t)rtm, len);
1053         for (i = 0; i < RTAX_MAX; i++) {
1054                 if ((sa = rtinfo->rti_info[i]) == NULL)
1055                         continue;
1056                 rtinfo->rti_addrs |= (1 << i);
1057                 dlen = SA_SIZE(sa);
1058 #ifdef INET6
1059                 if (V_deembed_scopeid && sa->sa_family == AF_INET6) {
1060                         sin6 = (struct sockaddr_in6 *)&ss;
1061                         bcopy(sa, sin6, sizeof(*sin6));
1062                         if (sa6_recoverscope(sin6) == 0)
1063                                 sa = (struct sockaddr *)sin6;
1064                 }
1065 #endif
1066                 m_copyback(m, len, dlen, (caddr_t)sa);
1067                 len += dlen;
1068         }
1069         if (m->m_pkthdr.len != len) {
1070                 m_freem(m);
1071                 return (NULL);
1072         }
1073         rtm->rtm_msglen = len;
1074         rtm->rtm_version = RTM_VERSION;
1075         rtm->rtm_type = type;
1076         return (m);
1077 }
1078
1079 /*
1080  * Writes information related to @rtinfo object to preallocated buffer.
1081  * Stores needed size in @plen. If @w is NULL, calculates size without
1082  * writing.
1083  * Used for sysctl dumps and rtsock answers (RTM_DEL/RTM_GET) generation.
1084  *
1085  * Returns 0 on success.
1086  *
1087  */
1088 static int
1089 rtsock_msg_buffer(int type, struct rt_addrinfo *rtinfo, struct walkarg *w, int *plen)
1090 {
1091         int i;
1092         int len, buflen = 0, dlen;
1093         caddr_t cp = NULL;
1094         struct rt_msghdr *rtm = NULL;
1095 #ifdef INET6
1096         struct sockaddr_storage ss;
1097         struct sockaddr_in6 *sin6;
1098 #endif
1099
1100         switch (type) {
1101
1102         case RTM_DELADDR:
1103         case RTM_NEWADDR:
1104                 if (w != NULL && w->w_op == NET_RT_IFLISTL) {
1105 #ifdef COMPAT_FREEBSD32
1106                         if (w->w_req->flags & SCTL_MASK32)
1107                                 len = sizeof(struct ifa_msghdrl32);
1108                         else
1109 #endif
1110                                 len = sizeof(struct ifa_msghdrl);
1111                 } else
1112                         len = sizeof(struct ifa_msghdr);
1113                 break;
1114
1115         case RTM_IFINFO:
1116 #ifdef COMPAT_FREEBSD32
1117                 if (w != NULL && w->w_req->flags & SCTL_MASK32) {
1118                         if (w->w_op == NET_RT_IFLISTL)
1119                                 len = sizeof(struct if_msghdrl32);
1120                         else
1121                                 len = sizeof(struct if_msghdr32);
1122                         break;
1123                 }
1124 #endif
1125                 if (w != NULL && w->w_op == NET_RT_IFLISTL)
1126                         len = sizeof(struct if_msghdrl);
1127                 else
1128                         len = sizeof(struct if_msghdr);
1129                 break;
1130
1131         case RTM_NEWMADDR:
1132                 len = sizeof(struct ifma_msghdr);
1133                 break;
1134
1135         default:
1136                 len = sizeof(struct rt_msghdr);
1137         }
1138
1139         if (w != NULL) {
1140                 rtm = (struct rt_msghdr *)w->w_tmem;
1141                 buflen = w->w_tmemsize - len;
1142                 cp = (caddr_t)w->w_tmem + len;
1143         }
1144
1145         rtinfo->rti_addrs = 0;
1146         for (i = 0; i < RTAX_MAX; i++) {
1147                 struct sockaddr *sa;
1148
1149                 if ((sa = rtinfo->rti_info[i]) == NULL)
1150                         continue;
1151                 rtinfo->rti_addrs |= (1 << i);
1152                 dlen = SA_SIZE(sa);
1153                 if (cp != NULL && buflen >= dlen) {
1154 #ifdef INET6
1155                         if (V_deembed_scopeid && sa->sa_family == AF_INET6) {
1156                                 sin6 = (struct sockaddr_in6 *)&ss;
1157                                 bcopy(sa, sin6, sizeof(*sin6));
1158                                 if (sa6_recoverscope(sin6) == 0)
1159                                         sa = (struct sockaddr *)sin6;
1160                         }
1161 #endif
1162                         bcopy((caddr_t)sa, cp, (unsigned)dlen);
1163                         cp += dlen;
1164                         buflen -= dlen;
1165                 } else if (cp != NULL) {
1166                         /*
1167                          * Buffer too small. Count needed size
1168                          * and return with error.
1169                          */
1170                         cp = NULL;
1171                 }
1172
1173                 len += dlen;
1174         }
1175
1176         if (cp != NULL) {
1177                 dlen = ALIGN(len) - len;
1178                 if (buflen < dlen)
1179                         cp = NULL;
1180                 else
1181                         buflen -= dlen;
1182         }
1183         len = ALIGN(len);
1184
1185         if (cp != NULL) {
1186                 /* fill header iff buffer is large enough */
1187                 rtm->rtm_version = RTM_VERSION;
1188                 rtm->rtm_type = type;
1189                 rtm->rtm_msglen = len;
1190         }
1191
1192         *plen = len;
1193
1194         if (w != NULL && cp == NULL)
1195                 return (ENOBUFS);
1196
1197         return (0);
1198 }
1199
1200 /*
1201  * This routine is called to generate a message from the routing
1202  * socket indicating that a redirect has occured, a routing lookup
1203  * has failed, or that a protocol has detected timeouts to a particular
1204  * destination.
1205  */
1206 void
1207 rt_missmsg_fib(int type, struct rt_addrinfo *rtinfo, int flags, int error,
1208     int fibnum)
1209 {
1210         struct rt_msghdr *rtm;
1211         struct mbuf *m;
1212         struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
1213
1214         if (V_route_cb.any_count == 0)
1215                 return;
1216         m = rtsock_msg_mbuf(type, rtinfo);
1217         if (m == NULL)
1218                 return;
1219
1220         if (fibnum != RT_ALL_FIBS) {
1221                 KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: fibnum out "
1222                     "of range 0 <= %d < %d", __func__, fibnum, rt_numfibs));
1223                 M_SETFIB(m, fibnum);
1224                 m->m_flags |= RTS_FILTER_FIB;
1225         }
1226
1227         rtm = mtod(m, struct rt_msghdr *);
1228         rtm->rtm_flags = RTF_DONE | flags;
1229         rtm->rtm_errno = error;
1230         rtm->rtm_addrs = rtinfo->rti_addrs;
1231         rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
1232 }
1233
1234 void
1235 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
1236 {
1237
1238         rt_missmsg_fib(type, rtinfo, flags, error, RT_ALL_FIBS);
1239 }
1240
1241 /*
1242  * This routine is called to generate a message from the routing
1243  * socket indicating that the status of a network interface has changed.
1244  */
1245 void
1246 rt_ifmsg(struct ifnet *ifp)
1247 {
1248         struct if_msghdr *ifm;
1249         struct mbuf *m;
1250         struct rt_addrinfo info;
1251
1252         if (V_route_cb.any_count == 0)
1253                 return;
1254         bzero((caddr_t)&info, sizeof(info));
1255         m = rtsock_msg_mbuf(RTM_IFINFO, &info);
1256         if (m == NULL)
1257                 return;
1258         ifm = mtod(m, struct if_msghdr *);
1259         ifm->ifm_index = ifp->if_index;
1260         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1261         if_data_copy(ifp, &ifm->ifm_data);
1262         ifm->ifm_addrs = 0;
1263         rt_dispatch(m, AF_UNSPEC);
1264 }
1265
1266 /*
1267  * Announce interface address arrival/withdraw.
1268  * Please do not call directly, use rt_addrmsg().
1269  * Assume input data to be valid.
1270  * Returns 0 on success.
1271  */
1272 int
1273 rtsock_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
1274 {
1275         struct rt_addrinfo info;
1276         struct sockaddr *sa;
1277         int ncmd;
1278         struct mbuf *m;
1279         struct ifa_msghdr *ifam;
1280         struct ifnet *ifp = ifa->ifa_ifp;
1281         struct sockaddr_storage ss;
1282
1283         if (V_route_cb.any_count == 0)
1284                 return (0);
1285
1286         ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
1287
1288         bzero((caddr_t)&info, sizeof(info));
1289         info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
1290         info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
1291         info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(
1292             info.rti_info[RTAX_IFP], ifa->ifa_netmask, &ss);
1293         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1294         if ((m = rtsock_msg_mbuf(ncmd, &info)) == NULL)
1295                 return (ENOBUFS);
1296         ifam = mtod(m, struct ifa_msghdr *);
1297         ifam->ifam_index = ifp->if_index;
1298         ifam->ifam_metric = ifa->ifa_ifp->if_metric;
1299         ifam->ifam_flags = ifa->ifa_flags;
1300         ifam->ifam_addrs = info.rti_addrs;
1301
1302         if (fibnum != RT_ALL_FIBS) {
1303                 M_SETFIB(m, fibnum);
1304                 m->m_flags |= RTS_FILTER_FIB;
1305         }
1306
1307         rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
1308
1309         return (0);
1310 }
1311
1312 /*
1313  * Announce route addition/removal.
1314  * Please do not call directly, use rt_routemsg().
1315  * Note that @rt data MAY be inconsistent/invalid:
1316  * if some userland app sends us "invalid" route message (invalid mask,
1317  * no dst, wrong address families, etc...) we need to pass it back
1318  * to app (and any other rtsock consumers) with rtm_errno field set to
1319  * non-zero value.
1320  *
1321  * Returns 0 on success.
1322  */
1323 int
1324 rtsock_routemsg(int cmd, struct ifnet *ifp, int error, struct rtentry *rt,
1325     int fibnum)
1326 {
1327         struct rt_addrinfo info;
1328         struct sockaddr *sa;
1329         struct mbuf *m;
1330         struct rt_msghdr *rtm;
1331         struct sockaddr_storage ss;
1332
1333         if (V_route_cb.any_count == 0)
1334                 return (0);
1335
1336         bzero((caddr_t)&info, sizeof(info));
1337         info.rti_info[RTAX_DST] = sa = rt_key(rt);
1338         info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(sa, rt_mask(rt), &ss);
1339         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1340         if ((m = rtsock_msg_mbuf(cmd, &info)) == NULL)
1341                 return (ENOBUFS);
1342         rtm = mtod(m, struct rt_msghdr *);
1343         rtm->rtm_index = ifp->if_index;
1344         rtm->rtm_flags |= rt->rt_flags;
1345         rtm->rtm_errno = error;
1346         rtm->rtm_addrs = info.rti_addrs;
1347
1348         if (fibnum != RT_ALL_FIBS) {
1349                 M_SETFIB(m, fibnum);
1350                 m->m_flags |= RTS_FILTER_FIB;
1351         }
1352
1353         rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
1354
1355         return (0);
1356 }
1357
1358 /*
1359  * This is the analogue to the rt_newaddrmsg which performs the same
1360  * function but for multicast group memberhips.  This is easier since
1361  * there is no route state to worry about.
1362  */
1363 void
1364 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
1365 {
1366         struct rt_addrinfo info;
1367         struct mbuf *m = NULL;
1368         struct ifnet *ifp = ifma->ifma_ifp;
1369         struct ifma_msghdr *ifmam;
1370
1371         if (V_route_cb.any_count == 0)
1372                 return;
1373
1374         bzero((caddr_t)&info, sizeof(info));
1375         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1376         info.rti_info[RTAX_IFP] = ifp ? ifp->if_addr->ifa_addr : NULL;
1377         /*
1378          * If a link-layer address is present, present it as a ``gateway''
1379          * (similarly to how ARP entries, e.g., are presented).
1380          */
1381         info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr;
1382         m = rtsock_msg_mbuf(cmd, &info);
1383         if (m == NULL)
1384                 return;
1385         ifmam = mtod(m, struct ifma_msghdr *);
1386         KASSERT(ifp != NULL, ("%s: link-layer multicast address w/o ifp\n",
1387             __func__));
1388         ifmam->ifmam_index = ifp->if_index;
1389         ifmam->ifmam_addrs = info.rti_addrs;
1390         rt_dispatch(m, ifma->ifma_addr ? ifma->ifma_addr->sa_family : AF_UNSPEC);
1391 }
1392
1393 static struct mbuf *
1394 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
1395         struct rt_addrinfo *info)
1396 {
1397         struct if_announcemsghdr *ifan;
1398         struct mbuf *m;
1399
1400         if (V_route_cb.any_count == 0)
1401                 return NULL;
1402         bzero((caddr_t)info, sizeof(*info));
1403         m = rtsock_msg_mbuf(type, info);
1404         if (m != NULL) {
1405                 ifan = mtod(m, struct if_announcemsghdr *);
1406                 ifan->ifan_index = ifp->if_index;
1407                 strlcpy(ifan->ifan_name, ifp->if_xname,
1408                         sizeof(ifan->ifan_name));
1409                 ifan->ifan_what = what;
1410         }
1411         return m;
1412 }
1413
1414 /*
1415  * This is called to generate routing socket messages indicating
1416  * IEEE80211 wireless events.
1417  * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
1418  */
1419 void
1420 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
1421 {
1422         struct mbuf *m;
1423         struct rt_addrinfo info;
1424
1425         m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
1426         if (m != NULL) {
1427                 /*
1428                  * Append the ieee80211 data.  Try to stick it in the
1429                  * mbuf containing the ifannounce msg; otherwise allocate
1430                  * a new mbuf and append.
1431                  *
1432                  * NB: we assume m is a single mbuf.
1433                  */
1434                 if (data_len > M_TRAILINGSPACE(m)) {
1435                         struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
1436                         if (n == NULL) {
1437                                 m_freem(m);
1438                                 return;
1439                         }
1440                         bcopy(data, mtod(n, void *), data_len);
1441                         n->m_len = data_len;
1442                         m->m_next = n;
1443                 } else if (data_len > 0) {
1444                         bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
1445                         m->m_len += data_len;
1446                 }
1447                 if (m->m_flags & M_PKTHDR)
1448                         m->m_pkthdr.len += data_len;
1449                 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
1450                 rt_dispatch(m, AF_UNSPEC);
1451         }
1452 }
1453
1454 /*
1455  * This is called to generate routing socket messages indicating
1456  * network interface arrival and departure.
1457  */
1458 void
1459 rt_ifannouncemsg(struct ifnet *ifp, int what)
1460 {
1461         struct mbuf *m;
1462         struct rt_addrinfo info;
1463
1464         m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
1465         if (m != NULL)
1466                 rt_dispatch(m, AF_UNSPEC);
1467 }
1468
1469 static void
1470 rt_dispatch(struct mbuf *m, sa_family_t saf)
1471 {
1472         struct m_tag *tag;
1473
1474         /*
1475          * Preserve the family from the sockaddr, if any, in an m_tag for
1476          * use when injecting the mbuf into the routing socket buffer from
1477          * the netisr.
1478          */
1479         if (saf != AF_UNSPEC) {
1480                 tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short),
1481                     M_NOWAIT);
1482                 if (tag == NULL) {
1483                         m_freem(m);
1484                         return;
1485                 }
1486                 *(unsigned short *)(tag + 1) = saf;
1487                 m_tag_prepend(m, tag);
1488         }
1489 #ifdef VIMAGE
1490         if (V_loif)
1491                 m->m_pkthdr.rcvif = V_loif;
1492         else {
1493                 m_freem(m);
1494                 return;
1495         }
1496 #endif
1497         netisr_queue(NETISR_ROUTE, m);  /* mbuf is free'd on failure. */
1498 }
1499
1500 /*
1501  * This is used in dumping the kernel table via sysctl().
1502  */
1503 static int
1504 sysctl_dumpentry(struct radix_node *rn, void *vw)
1505 {
1506         struct walkarg *w = vw;
1507         struct rtentry *rt = (struct rtentry *)rn;
1508         int error = 0, size;
1509         struct rt_addrinfo info;
1510         struct sockaddr_storage ss;
1511
1512         if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
1513                 return 0;
1514         if ((rt->rt_flags & RTF_HOST) == 0
1515             ? jailed_without_vnet(w->w_req->td->td_ucred)
1516             : prison_if(w->w_req->td->td_ucred, rt_key(rt)) != 0)
1517                 return (0);
1518         bzero((caddr_t)&info, sizeof(info));
1519         info.rti_info[RTAX_DST] = rt_key(rt);
1520         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1521         info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt),
1522             rt_mask(rt), &ss);
1523         info.rti_info[RTAX_GENMASK] = 0;
1524         if (rt->rt_ifp) {
1525                 info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr;
1526                 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
1527                 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
1528                         info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
1529         }
1530         if ((error = rtsock_msg_buffer(RTM_GET, &info, w, &size)) != 0)
1531                 return (error);
1532         if (w->w_req && w->w_tmem) {
1533                 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
1534
1535                 if (rt->rt_flags & RTF_GWFLAG_COMPAT)
1536                         rtm->rtm_flags = RTF_GATEWAY |
1537                                 (rt->rt_flags & ~RTF_GWFLAG_COMPAT);
1538                 else
1539                         rtm->rtm_flags = rt->rt_flags;
1540                 rt_getmetrics(rt, &rtm->rtm_rmx);
1541                 rtm->rtm_index = rt->rt_ifp->if_index;
1542                 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0;
1543                 rtm->rtm_addrs = info.rti_addrs;
1544                 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
1545                 return (error);
1546         }
1547         return (error);
1548 }
1549
1550 static int
1551 sysctl_iflist_ifml(struct ifnet *ifp, struct rt_addrinfo *info,
1552     struct walkarg *w, int len)
1553 {
1554         struct if_msghdrl *ifm;
1555         struct if_data *ifd;
1556
1557         ifm = (struct if_msghdrl *)w->w_tmem;
1558
1559 #ifdef COMPAT_FREEBSD32
1560         if (w->w_req->flags & SCTL_MASK32) {
1561                 struct if_msghdrl32 *ifm32;
1562
1563                 ifm32 = (struct if_msghdrl32 *)ifm;
1564                 ifm32->ifm_addrs = info->rti_addrs;
1565                 ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1566                 ifm32->ifm_index = ifp->if_index;
1567                 ifm32->_ifm_spare1 = 0;
1568                 ifm32->ifm_len = sizeof(*ifm32);
1569                 ifm32->ifm_data_off = offsetof(struct if_msghdrl32, ifm_data);
1570                 ifd = &ifm32->ifm_data;
1571         } else
1572 #endif
1573         {
1574                 ifm->ifm_addrs = info->rti_addrs;
1575                 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1576                 ifm->ifm_index = ifp->if_index;
1577                 ifm->_ifm_spare1 = 0;
1578                 ifm->ifm_len = sizeof(*ifm);
1579                 ifm->ifm_data_off = offsetof(struct if_msghdrl, ifm_data);
1580                 ifd = &ifm->ifm_data;
1581         }
1582
1583         if_data_copy(ifp, ifd);
1584
1585         return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
1586 }
1587
1588 static int
1589 sysctl_iflist_ifm(struct ifnet *ifp, struct rt_addrinfo *info,
1590     struct walkarg *w, int len)
1591 {
1592         struct if_msghdr *ifm;
1593         struct if_data *ifd;
1594
1595         ifm = (struct if_msghdr *)w->w_tmem;
1596
1597 #ifdef COMPAT_FREEBSD32
1598         if (w->w_req->flags & SCTL_MASK32) {
1599                 struct if_msghdr32 *ifm32;
1600
1601                 ifm32 = (struct if_msghdr32 *)ifm;
1602                 ifm32->ifm_addrs = info->rti_addrs;
1603                 ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1604                 ifm32->ifm_index = ifp->if_index;
1605                 ifd = &ifm32->ifm_data;
1606         } else
1607 #endif
1608         {
1609                 ifm->ifm_addrs = info->rti_addrs;
1610                 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1611                 ifm->ifm_index = ifp->if_index;
1612                 ifd = &ifm->ifm_data;
1613         }
1614
1615         if_data_copy(ifp, ifd);
1616
1617         return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
1618 }
1619
1620 static int
1621 sysctl_iflist_ifaml(struct ifaddr *ifa, struct rt_addrinfo *info,
1622     struct walkarg *w, int len)
1623 {
1624         struct ifa_msghdrl *ifam;
1625         struct if_data *ifd;
1626
1627         ifam = (struct ifa_msghdrl *)w->w_tmem;
1628
1629 #ifdef COMPAT_FREEBSD32
1630         if (w->w_req->flags & SCTL_MASK32) {
1631                 struct ifa_msghdrl32 *ifam32;
1632
1633                 ifam32 = (struct ifa_msghdrl32 *)ifam;
1634                 ifam32->ifam_addrs = info->rti_addrs;
1635                 ifam32->ifam_flags = ifa->ifa_flags;
1636                 ifam32->ifam_index = ifa->ifa_ifp->if_index;
1637                 ifam32->_ifam_spare1 = 0;
1638                 ifam32->ifam_len = sizeof(*ifam32);
1639                 ifam32->ifam_data_off =
1640                     offsetof(struct ifa_msghdrl32, ifam_data);
1641                 ifam32->ifam_metric = ifa->ifa_ifp->if_metric;
1642                 ifd = &ifam32->ifam_data;
1643         } else
1644 #endif
1645         {
1646                 ifam->ifam_addrs = info->rti_addrs;
1647                 ifam->ifam_flags = ifa->ifa_flags;
1648                 ifam->ifam_index = ifa->ifa_ifp->if_index;
1649                 ifam->_ifam_spare1 = 0;
1650                 ifam->ifam_len = sizeof(*ifam);
1651                 ifam->ifam_data_off = offsetof(struct ifa_msghdrl, ifam_data);
1652                 ifam->ifam_metric = ifa->ifa_ifp->if_metric;
1653                 ifd = &ifam->ifam_data;
1654         }
1655
1656         bzero(ifd, sizeof(*ifd));
1657         ifd->ifi_datalen = sizeof(struct if_data);
1658         ifd->ifi_ipackets = counter_u64_fetch(ifa->ifa_ipackets);
1659         ifd->ifi_opackets = counter_u64_fetch(ifa->ifa_opackets);
1660         ifd->ifi_ibytes = counter_u64_fetch(ifa->ifa_ibytes);
1661         ifd->ifi_obytes = counter_u64_fetch(ifa->ifa_obytes);
1662
1663         /* Fixup if_data carp(4) vhid. */
1664         if (carp_get_vhid_p != NULL)
1665                 ifd->ifi_vhid = (*carp_get_vhid_p)(ifa);
1666
1667         return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
1668 }
1669
1670 static int
1671 sysctl_iflist_ifam(struct ifaddr *ifa, struct rt_addrinfo *info,
1672     struct walkarg *w, int len)
1673 {
1674         struct ifa_msghdr *ifam;
1675
1676         ifam = (struct ifa_msghdr *)w->w_tmem;
1677         ifam->ifam_addrs = info->rti_addrs;
1678         ifam->ifam_flags = ifa->ifa_flags;
1679         ifam->ifam_index = ifa->ifa_ifp->if_index;
1680         ifam->ifam_metric = ifa->ifa_ifp->if_metric;
1681
1682         return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
1683 }
1684
1685 static int
1686 sysctl_iflist(int af, struct walkarg *w)
1687 {
1688         struct ifnet *ifp;
1689         struct ifaddr *ifa;
1690         struct rt_addrinfo info;
1691         int len, error = 0;
1692         struct sockaddr_storage ss;
1693
1694         bzero((caddr_t)&info, sizeof(info));
1695         IFNET_RLOCK_NOSLEEP();
1696         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1697                 if (w->w_arg && w->w_arg != ifp->if_index)
1698                         continue;
1699                 IF_ADDR_RLOCK(ifp);
1700                 ifa = ifp->if_addr;
1701                 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
1702                 error = rtsock_msg_buffer(RTM_IFINFO, &info, w, &len);
1703                 if (error != 0)
1704                         goto done;
1705                 info.rti_info[RTAX_IFP] = NULL;
1706                 if (w->w_req && w->w_tmem) {
1707                         if (w->w_op == NET_RT_IFLISTL)
1708                                 error = sysctl_iflist_ifml(ifp, &info, w, len);
1709                         else
1710                                 error = sysctl_iflist_ifm(ifp, &info, w, len);
1711                         if (error)
1712                                 goto done;
1713                 }
1714                 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != NULL) {
1715                         if (af && af != ifa->ifa_addr->sa_family)
1716                                 continue;
1717                         if (prison_if(w->w_req->td->td_ucred,
1718                             ifa->ifa_addr) != 0)
1719                                 continue;
1720                         info.rti_info[RTAX_IFA] = ifa->ifa_addr;
1721                         info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(
1722                             ifa->ifa_addr, ifa->ifa_netmask, &ss);
1723                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1724                         error = rtsock_msg_buffer(RTM_NEWADDR, &info, w, &len);
1725                         if (error != 0)
1726                                 goto done;
1727                         if (w->w_req && w->w_tmem) {
1728                                 if (w->w_op == NET_RT_IFLISTL)
1729                                         error = sysctl_iflist_ifaml(ifa, &info,
1730                                             w, len);
1731                                 else
1732                                         error = sysctl_iflist_ifam(ifa, &info,
1733                                             w, len);
1734                                 if (error)
1735                                         goto done;
1736                         }
1737                 }
1738                 IF_ADDR_RUNLOCK(ifp);
1739                 info.rti_info[RTAX_IFA] = NULL;
1740                 info.rti_info[RTAX_NETMASK] = NULL;
1741                 info.rti_info[RTAX_BRD] = NULL;
1742         }
1743 done:
1744         if (ifp != NULL)
1745                 IF_ADDR_RUNLOCK(ifp);
1746         IFNET_RUNLOCK_NOSLEEP();
1747         return (error);
1748 }
1749
1750 static int
1751 sysctl_ifmalist(int af, struct walkarg *w)
1752 {
1753         struct ifnet *ifp;
1754         struct ifmultiaddr *ifma;
1755         struct  rt_addrinfo info;
1756         int     len, error = 0;
1757         struct ifaddr *ifa;
1758
1759         bzero((caddr_t)&info, sizeof(info));
1760         IFNET_RLOCK_NOSLEEP();
1761         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1762                 if (w->w_arg && w->w_arg != ifp->if_index)
1763                         continue;
1764                 ifa = ifp->if_addr;
1765                 info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL;
1766                 IF_ADDR_RLOCK(ifp);
1767                 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1768                         if (af && af != ifma->ifma_addr->sa_family)
1769                                 continue;
1770                         if (prison_if(w->w_req->td->td_ucred,
1771                             ifma->ifma_addr) != 0)
1772                                 continue;
1773                         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1774                         info.rti_info[RTAX_GATEWAY] =
1775                             (ifma->ifma_addr->sa_family != AF_LINK) ?
1776                             ifma->ifma_lladdr : NULL;
1777                         error = rtsock_msg_buffer(RTM_NEWMADDR, &info, w, &len);
1778                         if (error != 0)
1779                                 goto done;
1780                         if (w->w_req && w->w_tmem) {
1781                                 struct ifma_msghdr *ifmam;
1782
1783                                 ifmam = (struct ifma_msghdr *)w->w_tmem;
1784                                 ifmam->ifmam_index = ifma->ifma_ifp->if_index;
1785                                 ifmam->ifmam_flags = 0;
1786                                 ifmam->ifmam_addrs = info.rti_addrs;
1787                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
1788                                 if (error) {
1789                                         IF_ADDR_RUNLOCK(ifp);
1790                                         goto done;
1791                                 }
1792                         }
1793                 }
1794                 IF_ADDR_RUNLOCK(ifp);
1795         }
1796 done:
1797         IFNET_RUNLOCK_NOSLEEP();
1798         return (error);
1799 }
1800
1801 static int
1802 sysctl_rtsock(SYSCTL_HANDLER_ARGS)
1803 {
1804         int     *name = (int *)arg1;
1805         u_int   namelen = arg2;
1806         struct radix_node_head *rnh = NULL; /* silence compiler. */
1807         int     i, lim, error = EINVAL;
1808         int     fib = 0;
1809         u_char  af;
1810         struct  walkarg w;
1811
1812         name ++;
1813         namelen--;
1814         if (req->newptr)
1815                 return (EPERM);
1816         if (name[1] == NET_RT_DUMP) {
1817                 if (namelen == 3)
1818                         fib = req->td->td_proc->p_fibnum;
1819                 else if (namelen == 4)
1820                         fib = (name[3] == RT_ALL_FIBS) ?
1821                             req->td->td_proc->p_fibnum : name[3];
1822                 else
1823                         return ((namelen < 3) ? EISDIR : ENOTDIR);
1824                 if (fib < 0 || fib >= rt_numfibs)
1825                         return (EINVAL);
1826         } else if (namelen != 3)
1827                 return ((namelen < 3) ? EISDIR : ENOTDIR);
1828         af = name[0];
1829         if (af > AF_MAX)
1830                 return (EINVAL);
1831         bzero(&w, sizeof(w));
1832         w.w_op = name[1];
1833         w.w_arg = name[2];
1834         w.w_req = req;
1835
1836         error = sysctl_wire_old_buffer(req, 0);
1837         if (error)
1838                 return (error);
1839
1840         /*
1841          * Allocate reply buffer in advance.
1842          * All rtsock messages has maximum length of u_short.
1843          */
1844         w.w_tmemsize = 65536;
1845         w.w_tmem = malloc(w.w_tmemsize, M_TEMP, M_WAITOK);
1846
1847         switch (w.w_op) {
1848
1849         case NET_RT_DUMP:
1850         case NET_RT_FLAGS:
1851                 if (af == 0) {                  /* dump all tables */
1852                         i = 1;
1853                         lim = AF_MAX;
1854                 } else                          /* dump only one table */
1855                         i = lim = af;
1856
1857                 /*
1858                  * take care of llinfo entries, the caller must
1859                  * specify an AF
1860                  */
1861                 if (w.w_op == NET_RT_FLAGS &&
1862                     (w.w_arg == 0 || w.w_arg & RTF_LLINFO)) {
1863                         if (af != 0)
1864                                 error = lltable_sysctl_dumparp(af, w.w_req);
1865                         else
1866                                 error = EINVAL;
1867                         break;
1868                 }
1869                 /*
1870                  * take care of routing entries
1871                  */
1872                 for (error = 0; error == 0 && i <= lim; i++) {
1873                         rnh = rt_tables_get_rnh(fib, i);
1874                         if (rnh != NULL) {
1875                                 RADIX_NODE_HEAD_RLOCK(rnh);
1876                                 error = rnh->rnh_walktree(rnh,
1877                                     sysctl_dumpentry, &w);
1878                                 RADIX_NODE_HEAD_RUNLOCK(rnh);
1879                         } else if (af != 0)
1880                                 error = EAFNOSUPPORT;
1881                 }
1882                 break;
1883
1884         case NET_RT_IFLIST:
1885         case NET_RT_IFLISTL:
1886                 error = sysctl_iflist(af, &w);
1887                 break;
1888
1889         case NET_RT_IFMALIST:
1890                 error = sysctl_ifmalist(af, &w);
1891                 break;
1892         }
1893
1894         free(w.w_tmem, M_TEMP);
1895         return (error);
1896 }
1897
1898 static SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, "");
1899
1900 /*
1901  * Definitions of protocols supported in the ROUTE domain.
1902  */
1903
1904 static struct domain routedomain;               /* or at least forward */
1905
1906 static struct protosw routesw[] = {
1907 {
1908         .pr_type =              SOCK_RAW,
1909         .pr_domain =            &routedomain,
1910         .pr_flags =             PR_ATOMIC|PR_ADDR,
1911         .pr_output =            route_output,
1912         .pr_ctlinput =          raw_ctlinput,
1913         .pr_init =              raw_init,
1914         .pr_usrreqs =           &route_usrreqs
1915 }
1916 };
1917
1918 static struct domain routedomain = {
1919         .dom_family =           PF_ROUTE,
1920         .dom_name =              "route",
1921         .dom_protosw =          routesw,
1922         .dom_protoswNPROTOSW =  &routesw[sizeof(routesw)/sizeof(routesw[0])]
1923 };
1924
1925 VNET_DOMAIN_SET(route);